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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 1,058,971	$ 220,831
Less Than 12 Months, Unrealized Losses	(33,042)	(1,396)
12 Months or More, Fair Value	68,421	72,730
12 Months or More, Unrealized Losses	(3,973)	(2,172)
Fair Value, Total	1,127,392	293,561
Unrealized Losses	(37,015)	(3,568)
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	309,601
Less Than 12 Months, Unrealized Losses	(15,050)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	309,601
Unrealized Losses	(15,050)
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	430,735	104,861
Less Than 12 Months, Unrealized Losses	(8,161)	(656)
12 Months or More, Fair Value	62,522	66,579
12 Months or More, Unrealized Losses	(3,695)	(2,143)
Fair Value, Total	493,257	171,440
Unrealized Losses	(11,856)	(2,799)
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	318,635	115,970
Less Than 12 Months, Unrealized Losses	(9,831)	(740)
12 Months or More, Fair Value	5,899	6,151
12 Months or More, Unrealized Losses	(278)	(29)
Fair Value, Total	324,534	122,121
Unrealized Losses	$ (10,109)	$ (769)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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